print("this is 'ex_2_calculate.py'")
print("1 + 1 =", 1 + 1)
print("1 - 1 =", 1 - 1)
print("2 * 2 =", 2 * 2)
print("3 / 2 =", 3 / 2)
print("5 % 2 =", 5 % 2)
print("5 < 2 ?", 5 < 2)
print("5 > 2 ?", 5 > 2)
print("5 + 1 <= 5 - 1 ?", 5 + 1 <= 5 - 1)
print("5 + 1 >= 5 - 1 ?", 5 + 1 >= 5 - 1)
